CN1712548A

CN1712548A - Short-pressure enhancing treatment of sweeping buffer spring

Info

Publication number: CN1712548A
Application number: CN 200510057046
Authority: CN
Inventors: 罗顺玲; 漆莉虹; 程刚; 向宏
Original assignee: Changan Automobile Group Co Ltd
Current assignee: Changan Automobile Group Co Ltd
Priority date: 2005-04-28
Filing date: 2005-04-28
Publication date: 2005-12-28

Abstract

A short pressure reinforcing process of struck buffer elastic spring. The process adopts repeating the way of short pressure reinforcing process when mechanic reinforcing. The elastic spring can be completely plastometric set so that it reaches content force output property and increases endurance life. The process is used for parts with big lead angle and high load which cannot be processed by short pressure and halt.

Description

Short-pressure enhancing treatment of sweeping buffer spring

Technical field

The invention belongs to spring manufacturing technology field, be specifically related to a kind of spring mechanical strengthening treatment process, be used for to bear big load, car rounding post whisker that lead angle is big carries out mechanical enhancer and handles.

Technical background

On spring design theory and manufacturing experience, if the residual stress in the spring material is opposite with working stress, then can improve the supporting capacity of spring, in the manufacturing processed of spring, to adopt mechanical enhancer technology, make the favourable residual stress of generation in the spring material surface, halting and handling or suppress processing is exactly the reinforcing process that present spring manufacturing is used.The processing of halting is exactly that spring is compressed to working limit height or also tight height several, generally is 3～5 times; Suppress processing and be meant that spring is depressed into each circle to be contacted, make the stress of material layer surpass yield-point, the negative residual stress of material surface generation, heart portion produces positive residual stress, to reach the purpose that improves spring capacity and stable geometrical dimension.The processing method of suppressing processing has two kinds, and a kind of is quiet suppressing, and spring is compressed to and height, keeps 6～48h, decontrols then, and this method takies process unit and equipment is more, and the production cycle is also long, is applicable to some little springs; Another kind method is spring to be compressed to and height with slower speed, slowly decontrols then, makes spring generation viscous deformation, the processing of halting again subsequently, and this method and the quiet effect same of having suppressed are applicable to all kinds of big springs.

Knowing according to investigation, for general vehicle brake buffer spring, all is to adopt traditional strengthening treatment process at present, has both suppressed and has handled or the processing of halting.But big to some lead angles, structure is special, the big buffer spring of load that bears, when adopting the traditional method intensive treatment, tension set has taken place in spring, the bending of spring body, and free length can not be replied, and can't reach the product design requirement.Therefore adopt which kind of technology that this class spring is carried out mechanical enhancer and handle, can guarantee geometrical dimension and output characteristic again simultaneously, produce qualified part, be improved the fatigue lifetime of spring, these all are the problems that needs solution.

Summary of the invention

The objective of the invention is to deficiency at existing spring manufacturing process, a kind of short-pressure enhancing treatment of sweeping buffer spring is proposed, replace traditional treatment process of suppressing, halt, vehicle brake buffer spring to big load, major spiral lift angle carries out the mechanical enhancer processing, solve spring and make the difficult problem that qualified part can't be processed, can't be produced to traditional diamond-making technique, can make spring that sufficient viscous deformation takes place and guarantee its geometrical dimension and output characteristic, improve the supporting capacity and the fatigue lifetime of such spring.

Technical solution of the present invention is as follows:

At first, spring is compressed to certain height, draught is prefabricated height H for the first time ₀' 10%～20%, and keep the i.e. 5～10min of certain hour, slowly unloading then; Through once compressing rear spring certain viscous deformation has taken place, free height can drop to H ₁';

Then, change the spring stress direction, for the second time slow loading spring to the second certain height, draught is at H ₁' 15%～25% between, and keep the same time, can drop to H by loading the rear spring free height for the second time ₂';

By that analogy, the repeated multiple times compression spring, each compression, corresponding viscous deformation all can take place in spring, and its deformation extent constantly reduces, and last compression spring also surpasses its end-of-job position H ₂, overrun and calculate by 15%～25% of spring working stroke, can allow spring that sufficient viscous deformation takes place, stablize its geometrical dimension and spring power, reach the supporting capacity of raising spring and the purpose of fatigue lifetime.

Present method need be determined each draught and final compressing height according to the difference of all kinds of spring parameters.

Present method particularly suitable lead angle is at 12 °～25 °, carry load in the P2 value greater than 2000N, especially greater than the car rounding post whisker of 4000N.

Technique effect of the present invention is as follows:

1, processing method solves the major spiral lift angle, the load vehicle brake buffer spring can not carry out the key issue of traditional intensive treatment greatly, can avoid spring generation tension set, and make spring that sufficient viscous deformation take place, the free height that guarantees spring can be stabilized in the small range, thereby guarantees the output characteristic of spring.

2, processing method solves the serious problem of the type vehicle brake buffer spring spring power decay, improves spring capacity;

3, handle by adopting short-pressureization that spring is carried out mechanical enhancer, the fatigue lifetime of having improved spring, guaranteed quality product.

4, the traditional diamond-making technique that spring is made has been broken in the proposition of this technology, is particularly useful for vibroshock spring, the buffer spring to big load, the manufacturing of kicker, and technological operation is simple, and is with short production cycle and strengthening effect good, stable performance.

Description of drawings

Fig. 1 is the product structure figure of certain product buffer spring;

Fig. 2 is the structure iron of special-purpose short-pressure processing anchor clamps;

Fig. 3 A is the stressed synoptic diagram of spring from the A end;

Fig. 3 B is the stressed synoptic diagram of spring from the B end.

Embodiment:

Below be the example process in detail to produce a kind of buffer spring:

The structural parameter of this spring are seen Fig. 1, the pitch 29mm of spring, section thickness 23.8 ₀ ^{+ 1.5}Mm, external diameter 47 _-0.25 ^{+ 0.2}Mm, internal diameter 18 _-0.2 ^{+ 0.6}Mm, finished product degree of growing tall H ₀Be 276 _-2 ^{+ 1.5}Mm, beginning state height H is opened in work ₁Be 262mm, pressure P ₁Be 26KN, end-of-job state height H ₂Be 238.5mm, pressure P ₂Be 73 ± 2KN, spring is pressed and height H _j: 217mm; Corresponding pressure P _j156KN

To calculate spring compression height for the first time according to the prefabricated height H I of spring earlier, and determine spring draught next time,, see Table 1 the pressure P of each time draught and correspondence ' and height H ' calculate according to each compression situation:

Table 1: the short test table look-up of pressing of buffer spring

The 6th pressure testing	??67.7	??100	??279.4	??68.9	??102	??278.9
The 6th pressure testing	??67.7	??100	??279.4	??68.9	??102	??278.9				Fabricated part	????????P2＝74.1KN ????????H0＝277.1mm			????????P2＝74.3KN ????????H0＝277.1mm			??P2＝74KN ??H0＝277.1mm

Then, spring is put into special-purpose short-pressure anchor clamps (see figure 2), and is placed on the spring testing machine, come into effect this processing method:

The 1st time: slowly load and compress the spring into prefabricated height H ₀10%～20% of ' 298.7mm, draught 48.7mm, on-load pressure P ' 85KN kept 5～10 minutes, allowed spring generation viscous deformation, unloading then, at this moment the spring height is H ' 293.1mm;

The 2nd time: change the spring stress direction, shown in Fig. 3 A and Fig. 3 B, change to the B end by the A end, the 2nd compression spring is to 10%～20% of H ' 293.1mm, draught 53.7mm, on-load pressure P ' 94KN,, kept 5～10 minutes, allow spring generation viscous deformation, unloading then is compressed to height H ' for 290.1mm;

3rd, analogize in proper order for 4,5,6 times, undertaken by listed parameter in the table 1, last draught must surpass spring working position H ₂, allow spring that sufficient viscous deformation takes place, stablize its dimensioning and spring power, obtain finished product at last, the finished product parameter sees Table 1.

Attention: the increase of each draught can not make spring spring body bend

Used the related data of the 1# part in the table to carry out the explanation of this processing method for above-mentioned, 2#, the 3# part implementing process that also can use the same method.

The short-pressure unit clamp structure of Shi Yonging is seen Fig. 2 in the method, it is made up of mandrel 1, clamp base 2, adjusting pad 3, outer protection tube 4, locking latch 5, loading briquetting 6 and steady brace 7, its mode of operation is: at first spring is put on (according to the prefabricated height of spring with mandrel 1, add suitable adjusting pad 3) the outer protection in the tube 4 of packing into, under the effect that loads briquetting 6, load, behind the specific position with locking latch 5 with spring locking and keep unloading after 5～10 minutes; Then spring is taken out back reverses its direction (increasing suitable adjusting pad) and carry out loading the second time, in proper order repeatedly, obtain needed dimensioning and spring power until spring.

Claims

1, short-pressure enhancing treatment of sweeping buffer spring is characterized in that described method carries out according to the following steps

(1) spring is compressed to certain height, draught is prefabricated height H ₀' 10%.～20%, and keep 5～10min, slowly unloading then, compression rear spring generation viscous deformation, free height drops to H ₁';

(2) change the force direction that is subjected to of spring, slow loading spring to the second certain height for the second time then, draught is H ₁' 15%～25%, and keep 5～10min, slowly be offloaded to certain height H again ₂';

(3), and make the end-of-job position height H of the certain height of its loading above spring by above-mentioned loading, discharging method repeated multiple times compression spring ₂, the scope that surpasses is calculated by 15%～25% of spring working stroke, makes spring that sufficient viscous deformation take place, and is stable and satisfy product requirement until its free length and geometrical dimension.

2, short-pressure enhancing treatment of sweeping buffer spring according to claim 1, it is characterized in that described spring be lead angle at 12 °～25 °, carry load is at the car rounding post whisker of P2 value greater than 2000N.